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When using the ARM AAPCS, HFAs (Homogeneous Floating-point Aggregates) must be passed in a block of consecutive floating-point registers, or on the stack. This means that unused floating-point registers cannot be back-filled with part of an HFA, however this can currently happen. This patch, along with the corresponding clang patch (http://reviews.llvm.org/D3083) prevents this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208413 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
2.0 KiB
LLVM
95 lines
2.0 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-n32-S64"
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target triple = "armv7-none--gnueabihf"
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%struct.s = type { float, float }
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%union.t = type { [4 x float] }
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; Equivalent C code:
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; struct s { float a; float b; };
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; float foo(float a, double b, struct s c) { return c.a; }
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; Argument allocation:
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; a -> s0
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; b -> d1
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; c -> s4, s5
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; s1 is unused
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; return in s0
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define float @test1(float %a, double %b, %struct.s %c) {
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entry:
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; CHECK-LABEL: test1
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; CHECK: vmov.f32 s0, s4
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; CHECK-NOT: vmov.f32 s0, s1
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%result = extractvalue %struct.s %c, 0
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ret float %result
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}
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; Equivalent C code:
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; union t { float a[4] };
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; float foo(float a, double b, union s c) { return c.a[0]; }
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; Argument allocation:
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; a -> s0
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; b -> d1
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; c -> s4..s7
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define float @test2(float %a, double %b, %union.t %c) #0 {
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entry:
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; CHECK-LABEL: test2
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; CHECK: vmov.f32 s0, s4
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; CHECK-NOT: vmov.f32 s0, s1
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%result = extractvalue %union.t %c, 0, 0
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ret float %result
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}
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; Equivalent C code:
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; struct s { float a; float b; };
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; float foo(float a, double b, struct s c, float d) { return d; }
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; Argument allocation:
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; a -> s0
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; b -> d1
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; c -> s4, s5
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; d -> s1
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; return in s0
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define float @test3(float %a, double %b, %struct.s %c, float %d) {
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entry:
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; CHECK-LABEL: test3
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; CHECK: vmov.f32 s0, s1
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; CHECK-NOT: vmov.f32 s0, s5
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ret float %d
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}
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; Equivalent C code:
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; struct s { float a; float b; };
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; float foo(struct s a, struct s b) { return b.b; }
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; Argument allocation:
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; a -> s0, s1
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; b -> s2, s3
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; return in s0
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define float @test4(%struct.s %a, %struct.s %b) {
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entry:
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; CHECK-LABEL: test4
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; CHECK: vmov.f32 s0, s3
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%result = extractvalue %struct.s %b, 1
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ret float %result
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}
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; Equivalent C code:
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; struct s { float a; float b; };
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; float foo(struct s a, float b, struct s c) { return c.a; }
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; Argument allocation:
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; a -> s0, s1
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; b -> s2
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; c -> s3, s4
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; return in s0
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define float @test5(%struct.s %a, float %b, %struct.s %c) {
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entry:
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; CHECK-LABEL: test5
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; CHECK: vmov.f32 s0, s3
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%result = extractvalue %struct.s %c, 0
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ret float %result
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}
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