add patch fixing broken m68k sqrt
gcc pr 95921. the m68k sqrt rtl handles excess precision wrong. I couldn't figure out how to make gcc generate the insn only for long double, but since long double usage is rare anyway, just remove it. this can be replaced with a proper fix later if there's ever one upstream.
This commit is contained in:
Rich Felker
parent
b0820cc501
commit
d04fb4943f
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--- gcc-9.2.0.orig/gcc/config/m68k/m68k.md 2019-01-01 07:31:55.000000000 -0500
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+++ gcc-9.2.0/gcc/config/m68k/m68k.md 2020-06-30 15:56:20.061868526 -0400
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@@ -4121,35 +4121,6 @@
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return "f<FP:prec>neg%.<FP:prec> %1,%0";
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})
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-;; Sqrt instruction for the 68881
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-
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-(define_expand "sqrt<mode>2"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "")))]
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- "TARGET_HARD_FLOAT"
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- "")
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-
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-(define_insn "sqrt<mode>2_68881"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg>m")))]
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- "TARGET_68881"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:round>sqrt%.x %1,%0";
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- return "f<FP:round>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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-
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-(define_insn "sqrt<mode>2_cf"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg><Q>U")))]
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- "TARGET_COLDFIRE_FPU"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:prec>sqrt%.d %1,%0";
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- return "f<FP:prec>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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;; Absolute value instructions
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;; If using software floating point, just zero the sign bit.
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@ -0,0 +1,38 @@
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--- gcc-9.2.0.orig/gcc/config/m68k/m68k.md 2019-01-01 07:31:55.000000000 -0500
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+++ gcc-9.2.0/gcc/config/m68k/m68k.md 2020-06-30 15:56:20.061868526 -0400
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@@ -4121,35 +4121,6 @@
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return "f<FP:prec>neg%.<FP:prec> %1,%0";
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})
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-;; Sqrt instruction for the 68881
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-
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-(define_expand "sqrt<mode>2"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "")))]
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- "TARGET_HARD_FLOAT"
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- "")
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-
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-(define_insn "sqrt<mode>2_68881"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg>m")))]
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- "TARGET_68881"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:round>sqrt%.x %1,%0";
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- return "f<FP:round>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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-
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-(define_insn "sqrt<mode>2_cf"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg><Q>U")))]
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- "TARGET_COLDFIRE_FPU"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:prec>sqrt%.d %1,%0";
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- return "f<FP:prec>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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;; Absolute value instructions
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;; If using software floating point, just zero the sign bit.
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@ -0,0 +1,38 @@
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--- gcc-9.2.0.orig/gcc/config/m68k/m68k.md 2019-01-01 07:31:55.000000000 -0500
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+++ gcc-9.2.0/gcc/config/m68k/m68k.md 2020-06-30 15:56:20.061868526 -0400
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@@ -4121,35 +4121,6 @@
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return "f<FP:prec>neg%.<FP:prec> %1,%0";
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})
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-;; Sqrt instruction for the 68881
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-
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-(define_expand "sqrt<mode>2"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "")))]
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- "TARGET_HARD_FLOAT"
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- "")
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-
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-(define_insn "sqrt<mode>2_68881"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg>m")))]
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- "TARGET_68881"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:round>sqrt%.x %1,%0";
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- return "f<FP:round>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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-
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-(define_insn "sqrt<mode>2_cf"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg><Q>U")))]
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- "TARGET_COLDFIRE_FPU"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:prec>sqrt%.d %1,%0";
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- return "f<FP:prec>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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;; Absolute value instructions
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;; If using software floating point, just zero the sign bit.
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@ -0,0 +1,38 @@
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--- gcc-9.2.0.orig/gcc/config/m68k/m68k.md 2019-01-01 07:31:55.000000000 -0500
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+++ gcc-9.2.0/gcc/config/m68k/m68k.md 2020-06-30 15:56:20.061868526 -0400
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@@ -4121,35 +4121,6 @@
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return "f<FP:prec>neg%.<FP:prec> %1,%0";
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})
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-;; Sqrt instruction for the 68881
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-
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-(define_expand "sqrt<mode>2"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "")))]
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- "TARGET_HARD_FLOAT"
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- "")
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-
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-(define_insn "sqrt<mode>2_68881"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg>m")))]
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- "TARGET_68881"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:round>sqrt%.x %1,%0";
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- return "f<FP:round>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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-
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-(define_insn "sqrt<mode>2_cf"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg><Q>U")))]
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- "TARGET_COLDFIRE_FPU"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:prec>sqrt%.d %1,%0";
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- return "f<FP:prec>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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;; Absolute value instructions
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;; If using software floating point, just zero the sign bit.
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@ -0,0 +1,38 @@
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--- gcc-9.2.0.orig/gcc/config/m68k/m68k.md 2019-01-01 07:31:55.000000000 -0500
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+++ gcc-9.2.0/gcc/config/m68k/m68k.md 2020-06-30 15:56:20.061868526 -0400
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@@ -4121,35 +4121,6 @@
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return "f<FP:prec>neg%.<FP:prec> %1,%0";
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})
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-;; Sqrt instruction for the 68881
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-
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-(define_expand "sqrt<mode>2"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "")))]
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- "TARGET_HARD_FLOAT"
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- "")
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-
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-(define_insn "sqrt<mode>2_68881"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg>m")))]
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- "TARGET_68881"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:round>sqrt%.x %1,%0";
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- return "f<FP:round>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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-
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-(define_insn "sqrt<mode>2_cf"
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- [(set (match_operand:FP 0 "nonimmediate_operand" "=f")
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- (sqrt:FP (match_operand:FP 1 "general_operand" "f<FP:dreg><Q>U")))]
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- "TARGET_COLDFIRE_FPU"
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-{
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- if (FP_REG_P (operands[1]))
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- return "f<FP:prec>sqrt%.d %1,%0";
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- return "f<FP:prec>sqrt%.<FP:prec> %1,%0";
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-}
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- [(set_attr "type" "fsqrt")])
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;; Absolute value instructions
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;; If using software floating point, just zero the sign bit.
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