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66b0f515d5
X86FloatingPoint keeps track of pending ST registers for an upcoming inline asm instruction with fixed stack register constraints. It does this by remembering which FP register holds the value that should appear at a fixed stack position for the inline asm. When that FP register is killed before the inline asm, make sure to duplicate it to a scratch register, so the ST register still has a live FP reference. This could happen when the same FP register was copied to two ST registers, or when a spill instruction is inserted between the ST copy and the inline asm. This fixes PR10602. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137050 91177308-0d34-0410-b5e6-96231b3b80d8
343 lines
9.5 KiB
LLVM
343 lines
9.5 KiB
LLVM
; RUN: llc < %s -mtriple=i386-apple-darwin | FileCheck %s
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; There should be no stack manipulations between the inline asm and ret.
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; CHECK: test1
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; CHECK: InlineAsm End
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; CHECK-NEXT: ret
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define x86_fp80 @test1() {
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%tmp85 = call x86_fp80 asm sideeffect "fld0", "={st(0)}"()
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ret x86_fp80 %tmp85
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}
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; CHECK: test2
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; CHECK: InlineAsm End
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; CHECK-NEXT: ret
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define double @test2() {
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%tmp85 = call double asm sideeffect "fld0", "={st(0)}"()
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ret double %tmp85
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}
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; Setting up argument in st(0) should be a single fld.
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; CHECK: test3
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; CHECK: fld
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; CHECK-NEXT: InlineAsm Start
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; Asm consumes stack, nothing should be popped.
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; CHECK: InlineAsm End
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; CHECK-NOT: fstp
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; CHECK: ret
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define void @test3(x86_fp80 %X) {
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call void asm sideeffect "frob ", "{st(0)},~{st},~{dirflag},~{fpsr},~{flags}"( x86_fp80 %X)
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ret void
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}
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; CHECK: test4
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; CHECK: fld
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; CHECK-NEXT: InlineAsm Start
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; CHECK: InlineAsm End
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; CHECK-NOT: fstp
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; CHECK: ret
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define void @test4(double %X) {
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call void asm sideeffect "frob ", "{st(0)},~{st},~{dirflag},~{fpsr},~{flags}"( double %X)
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ret void
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}
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; Same as test3/4, but using value from fadd.
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; The fadd can be done in xmm or x87 regs - we don't test that.
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; CHECK: test5
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; CHECK: InlineAsm End
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; CHECK-NOT: fstp
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; CHECK: ret
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define void @test5(double %X) {
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%Y = fadd double %X, 123.0
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call void asm sideeffect "frob ", "{st(0)},~{st},~{dirflag},~{fpsr},~{flags}"( double %Y)
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ret void
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}
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; CHECK: test6
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define void @test6(double %A, double %B, double %C,
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double %D, double %E) nounwind {
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entry:
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; Uses the same value twice, should have one fstp after the asm.
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; CHECK: foo
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; CHECK: InlineAsm End
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; CHECK-NEXT: fstp
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; CHECK-NOT: fstp
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tail call void asm sideeffect "foo $0 $1", "f,f,~{dirflag},~{fpsr},~{flags}"( double %A, double %A ) nounwind
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; Uses two different values, should be in st(0)/st(1) and both be popped.
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; CHECK: bar
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; CHECK: InlineAsm End
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; CHECK-NEXT: fstp
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; CHECK-NEXT: fstp
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tail call void asm sideeffect "bar $0 $1", "f,f,~{dirflag},~{fpsr},~{flags}"( double %B, double %C ) nounwind
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; Uses two different values, one of which isn't killed in this asm, it
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; should not be popped after the asm.
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; CHECK: baz
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; CHECK: InlineAsm End
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; CHECK-NEXT: fstp
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; CHECK-NOT: fstp
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tail call void asm sideeffect "baz $0 $1", "f,f,~{dirflag},~{fpsr},~{flags}"( double %D, double %E ) nounwind
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; This is the last use of %D, so it should be popped after.
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; CHECK: baz
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; CHECK: InlineAsm End
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; CHECK-NEXT: fstp
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; CHECK-NOT: fstp
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; CHECK: ret
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tail call void asm sideeffect "baz $0", "f,~{dirflag},~{fpsr},~{flags}"( double %D ) nounwind
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ret void
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}
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; PR4185
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; Passing a non-killed value to asm in {st}.
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; Make sure it is duped before.
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; asm kills st(0), so we shouldn't pop anything
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; CHECK: testPR4185
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; CHECK: fld %st(0)
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; CHECK: fistpl
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; CHECK-NOT: fstp
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; CHECK: fistpl
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; CHECK-NOT: fstp
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; CHECK: ret
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; A valid alternative would be to remat the constant pool load before each
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; inline asm.
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define void @testPR4185() {
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return:
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call void asm sideeffect "fistpl $0", "{st},~{st}"(double 1.000000e+06)
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call void asm sideeffect "fistpl $0", "{st},~{st}"(double 1.000000e+06)
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ret void
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}
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; Passing a non-killed value through asm in {st}.
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; Make sure it is not duped before.
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; Second asm kills st(0), so we shouldn't pop anything
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; CHECK: testPR4185b
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; CHECK-NOT: fld %st(0)
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; CHECK: fistl
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; CHECK-NOT: fstp
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; CHECK: fistpl
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; CHECK-NOT: fstp
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; CHECK: ret
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; A valid alternative would be to remat the constant pool load before each
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; inline asm.
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define void @testPR4185b() {
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return:
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call void asm sideeffect "fistl $0", "{st}"(double 1.000000e+06)
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call void asm sideeffect "fistpl $0", "{st},~{st}"(double 1.000000e+06)
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ret void
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}
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; PR4459
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; The return value from ceil must be duped before being consumed by asm.
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; CHECK: testPR4459
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; CHECK: ceil
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; CHECK: fld %st(0)
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; CHECK-NOT: fxch
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; CHECK: fistpl
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; CHECK-NOT: fxch
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; CHECK: fstpt
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; CHECK: test
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define void @testPR4459(x86_fp80 %a) {
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entry:
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%0 = call x86_fp80 @ceil(x86_fp80 %a)
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call void asm sideeffect "fistpl $0", "{st},~{st}"( x86_fp80 %0)
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call void @test3(x86_fp80 %0 )
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ret void
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}
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declare x86_fp80 @ceil(x86_fp80)
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; PR4484
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; test1 leaves a value on the stack that is needed after the asm.
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; CHECK: testPR4484
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; CHECK: test1
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; CHECK-NOT: fstp
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; Load %a from stack after ceil
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; CHECK: fldt
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; CHECK-NOT: fxch
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; CHECK: fistpl
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; CHECK-NOT: fstp
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; Set up call to test.
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; CHECK: fstpt
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; CHECK: test
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define void @testPR4484(x86_fp80 %a) {
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entry:
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%0 = call x86_fp80 @test1()
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call void asm sideeffect "fistpl $0", "{st},~{st}"(x86_fp80 %a)
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call void @test3(x86_fp80 %0)
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ret void
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}
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; PR4485
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; CHECK: testPR4485
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define void @testPR4485(x86_fp80* %a) {
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entry:
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%0 = load x86_fp80* %a, align 16
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%1 = fmul x86_fp80 %0, 0xK4006B400000000000000
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%2 = fmul x86_fp80 %1, 0xK4012F424000000000000
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tail call void asm sideeffect "fistpl $0", "{st},~{st}"(x86_fp80 %2)
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%3 = load x86_fp80* %a, align 16
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%4 = fmul x86_fp80 %3, 0xK4006B400000000000000
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%5 = fmul x86_fp80 %4, 0xK4012F424000000000000
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tail call void asm sideeffect "fistpl $0", "{st},~{st}"(x86_fp80 %5)
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ret void
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}
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; An input argument in a fixed position is implicitly popped by the asm only if
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; the input argument is tied to an output register, or it is in the clobber list.
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; The clobber list case is tested above.
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;
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; This doesn't implicitly pop the stack:
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;
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; void fist1(long double x, int *p) {
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; asm volatile ("fistl %1" : : "t"(x), "m"(*p));
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; }
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;
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; CHECK: fist1
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; CHECK: fldt
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; CHECK: fistl (%e
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; CHECK: fstp
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; CHECK: ret
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define void @fist1(x86_fp80 %x, i32* %p) nounwind ssp {
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entry:
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tail call void asm sideeffect "fistl $1", "{st},*m,~{memory},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, i32* %p) nounwind
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ret void
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}
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; Here, the input operand is tied to an output which means that is is
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; implicitly popped (and then the output is implicitly pushed).
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;
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; long double fist2(long double x, int *p) {
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; long double y;
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; asm ("fistl %1" : "=&t"(y) : "0"(x), "m"(*p) : "memory");
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; return y;
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; }
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;
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; CHECK: fist2
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; CHECK: fldt
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; CHECK: fistl (%e
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; CHECK-NOT: fstp
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; CHECK: ret
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define x86_fp80 @fist2(x86_fp80 %x, i32* %p) nounwind ssp {
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entry:
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%0 = tail call x86_fp80 asm "fistl $2", "=&{st},0,*m,~{memory},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, i32* %p) nounwind
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ret x86_fp80 %0
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}
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; An 'f' constraint is never implicitly popped:
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;
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; void fucomp1(long double x, long double y) {
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; asm volatile ("fucomp %1" : : "t"(x), "f"(y) : "st");
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; }
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; CHECK: fucomp1
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; CHECK: fldt
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; CHECK: fldt
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; CHECK: fucomp %st
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; CHECK: fstp
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; CHECK-NOT: fstp
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; CHECK: ret
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define void @fucomp1(x86_fp80 %x, x86_fp80 %y) nounwind ssp {
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entry:
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tail call void asm sideeffect "fucomp $1", "{st},f,~{st},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, x86_fp80 %y) nounwind
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ret void
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}
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; The 'u' constraint is only popped implicitly when clobbered:
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;
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; void fucomp2(long double x, long double y) {
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; asm volatile ("fucomp %1" : : "t"(x), "u"(y) : "st");
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; }
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;
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; void fucomp3(long double x, long double y) {
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; asm volatile ("fucompp %1" : : "t"(x), "u"(y) : "st", "st(1)");
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; }
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;
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; CHECK: fucomp2
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; CHECK: fldt
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; CHECK: fldt
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; CHECK: fucomp %st(1)
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; CHECK: fstp
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; CHECK-NOT: fstp
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; CHECK: ret
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;
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; CHECK: fucomp3
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; CHECK: fldt
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; CHECK: fldt
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; CHECK: fucompp %st(1)
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; CHECK-NOT: fstp
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; CHECK: ret
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define void @fucomp2(x86_fp80 %x, x86_fp80 %y) nounwind ssp {
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entry:
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tail call void asm sideeffect "fucomp $1", "{st},{st(1)},~{st},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, x86_fp80 %y) nounwind
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ret void
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}
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define void @fucomp3(x86_fp80 %x, x86_fp80 %y) nounwind ssp {
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entry:
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tail call void asm sideeffect "fucompp $1", "{st},{st(1)},~{st},~{st(1)},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, x86_fp80 %y) nounwind
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ret void
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}
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; One input, two outputs, one dead output.
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%complex = type { float, float }
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; CHECK: sincos1
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; CHECK: flds
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; CHECK-NOT: fxch
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; CHECK: sincos
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; CHECK-NOT: fstp
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; CHECK: fstp %st(1)
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; CHECK-NOT: fstp
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; CHECK: ret
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define float @sincos1(float %x) nounwind ssp {
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entry:
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%0 = tail call %complex asm "sincos", "={st},={st(1)},0,~{dirflag},~{fpsr},~{flags}"(float %x) nounwind
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%asmresult = extractvalue %complex %0, 0
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ret float %asmresult
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}
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; Same thing, swapped output operands.
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; CHECK: sincos2
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; CHECK: flds
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; CHECK-NOT: fxch
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; CHECK: sincos
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; CHECK-NOT: fstp
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; CHECK: fstp %st(1)
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; CHECK-NOT: fstp
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; CHECK: ret
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define float @sincos2(float %x) nounwind ssp {
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entry:
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%0 = tail call %complex asm "sincos", "={st(1)},={st},1,~{dirflag},~{fpsr},~{flags}"(float %x) nounwind
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%asmresult = extractvalue %complex %0, 1
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ret float %asmresult
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}
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; Clobber st(0) after it was live-out/dead from the previous asm.
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; CHECK: sincos3
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; Load x, make a copy for the second asm.
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; CHECK: flds
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; CHECK: fld %st(0)
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; CHECK: sincos
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; Discard dead result in st(0), bring x to the top.
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; CHECK: fstp %st(0)
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; CHECK: fxch
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; x is now in st(0) for the second asm
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; CHECK: sincos
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; Discard both results.
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; CHECK: fstp
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; CHECK: fstp
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; CHECK: ret
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define float @sincos3(float %x) nounwind ssp {
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entry:
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%0 = tail call %complex asm sideeffect "sincos", "={st(1)},={st},1,~{dirflag},~{fpsr},~{flags}"(float %x) nounwind
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%1 = tail call %complex asm sideeffect "sincos", "={st(1)},={st},1,~{dirflag},~{fpsr},~{flags}"(float %x) nounwind
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%asmresult = extractvalue %complex %0, 0
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ret float %asmresult
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}
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; Pass the same value in two fixed stack slots.
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; CHECK: PR10602
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; CHECK: flds LCPI
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; CHECK: fld %st(0)
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; CHECK: fcomi %st(1), %st(0)
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define i32 @PR10602() nounwind ssp {
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entry:
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%0 = tail call i32 asm "fcomi $2, $1; pushf; pop $0", "=r,{st},{st(1)},~{dirflag},~{fpsr},~{flags}"(double 2.000000e+00, double 2.000000e+00) nounwind
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ret i32 %0
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}
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