114 lines
3.7 KiB
LLVM
114 lines
3.7 KiB
LLVM
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; RUN: opt < %s -S -mtriple=amdgcn-- -loop-unroll | FileCheck %s
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; Check the handling of amdgpu.loop.unroll.threshold metadata which can be used to
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; set the default threshold for a loop. This metadata overrides both the AMDGPU
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; default, and any value specified by the amdgpu-unroll-threshold function attribute
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; (which sets a threshold for all loops in the function).
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; Check that the loop in unroll_default is not fully unrolled using the default
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; unroll threshold
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; CHECK-LABEL: @unroll_default
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; CHECK: entry:
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; CHECK: br i1 %cmp
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; CHECK: ret void
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@in = internal unnamed_addr global i32* null, align 8
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@out = internal unnamed_addr global i32* null, align 8
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define void @unroll_default() {
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entry:
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br label %do.body
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do.body: ; preds = %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %do.body ]
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%v1 = load i64, i64* bitcast (i32** @in to i64*), align 8
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store i64 %v1, i64* bitcast (i32** @out to i64*), align 8
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%inc = add nsw i32 %i.0, 1
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%cmp = icmp slt i32 %inc, 100
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br i1 %cmp, label %do.body, label %do.end
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do.end: ; preds = %do.body
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ret void
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}
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; Check that the same loop in unroll_full is fully unrolled when the default
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; unroll threshold is increased by use of the amdgpu.loop.unroll.threshold metadata
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; CHECK-LABEL: @unroll_full
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; CHECK: entry:
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; CHECK-NOT: br i1 %cmp
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; CHECK: ret void
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define void @unroll_full() {
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entry:
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br label %do.body
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do.body: ; preds = %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %do.body ]
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%v1 = load i64, i64* bitcast (i32** @in to i64*), align 8
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store i64 %v1, i64* bitcast (i32** @out to i64*), align 8
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%inc = add nsw i32 %i.0, 1
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%cmp = icmp slt i32 %inc, 100
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br i1 %cmp, label %do.body, label %do.end, !llvm.loop !1
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do.end: ; preds = %do.body
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ret void
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}
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; Check that the same loop in override_no_unroll is not unrolled when a high default
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; unroll threshold specified using the amdgpu-unroll-threshold function attribute
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; is overridden by a low threshold using the amdgpu.loop.unroll.threshold metadata
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; CHECK-LABEL: @override_no_unroll
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; CHECK: entry:
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; CHECK: br i1 %cmp
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; CHECK: ret void
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define void @override_no_unroll() #0 {
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entry:
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br label %do.body
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do.body: ; preds = %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %do.body ]
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%v1 = load i64, i64* bitcast (i32** @in to i64*), align 8
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store i64 %v1, i64* bitcast (i32** @out to i64*), align 8
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%inc = add nsw i32 %i.0, 1
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%cmp = icmp slt i32 %inc, 100
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br i1 %cmp, label %do.body, label %do.end, !llvm.loop !3
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do.end: ; preds = %do.body
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ret void
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}
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; Check that the same loop in override_unroll is fully unrolled when a low default
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; unroll threshold specified using the amdgpu-unroll-threshold function attribute
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; is overridden by a high threshold using the amdgpu.loop.unroll.threshold metadata
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; CHECK-LABEL: @override_unroll
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; CHECK: entry:
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; CHECK-NOT: br i1 %cmp
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; CHECK: ret void
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define void @override_unroll() #1 {
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entry:
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br label %do.body
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do.body: ; preds = %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %do.body ]
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%v1 = load i64, i64* bitcast (i32** @in to i64*), align 8
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store i64 %v1, i64* bitcast (i32** @out to i64*), align 8
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%inc = add nsw i32 %i.0, 1
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%cmp = icmp slt i32 %inc, 100
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br i1 %cmp, label %do.body, label %do.end, !llvm.loop !1
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do.end: ; preds = %do.body
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ret void
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}
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attributes #0 = { "amdgpu-unroll-threshold"="1000" }
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attributes #1 = { "amdgpu-unroll-threshold"="100" }
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!1 = !{!1, !2}
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!2 = !{!"amdgpu.loop.unroll.threshold", i32 1000}
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!3 = !{!3, !4}
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!4 = !{!"amdgpu.loop.unroll.threshold", i32 100}
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