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llvm-project/llvm/test/CodeGen/X86/fold-push.ll

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[X86] Allow load folding into PUSH instructions Adds pushes to the folding tables. This also required a fix to the TD definition, since the memory forms of the push instructions did not have the right mayLoad/mayStore flags. Differential Revision: http://reviews.llvm.org/D11340 llvm-svn: 243010
2015-07-23 20:23:45 +08:00
; RUN: llc < %s -mtriple=i686-windows | FileCheck %s -check-prefix=CHECK -check-prefix=NORMAL
; RUN: llc < %s -mtriple=i686-windows -mattr=call-reg-indirect | FileCheck %s -check-prefix=CHECK -check-prefix=SLM
declare void @foo(i32 %r)
define void @test(i32 %a, i32 %b) optsize {
; CHECK-LABEL: test:
; CHECK: movl [[EAX:%e..]], (%esp)
; CHECK-NEXT: pushl [[EAX]]
; CHECK-NEXT: calll
; CHECK-NEXT: addl $4, %esp
; CHECK: nop
; NORMAL: pushl (%esp)
; SLM: movl (%esp), [[RELOAD:%e..]]
; SLM-NEXT: pushl [[RELOAD]]
; CHECK: calll
; CHECK-NEXT: addl $4, %esp
%c = add i32 %a, %b
call void @foo(i32 %c)
call void asm sideeffect "nop", "~{ax},~{bx},~{cx},~{dx},~{bp},~{si},~{di}"()
call void @foo(i32 %c)
ret void
}
define void @test_min(i32 %a, i32 %b) minsize {
; CHECK-LABEL: test_min:
; CHECK: movl [[EAX:%e..]], (%esp)
; CHECK-NEXT: pushl [[EAX]]
; CHECK-NEXT: calll
[X86] When optimizing for minsize, use POP for small post-call stack clean-up When optimizing for size, replace "addl $4, %esp" and "addl $8, %esp" following a call by one or two pops, respectively. We don't try to do it in general, but only when the stack adjustment immediately follows a call - which is the most common case. That allows taking a short-cut when trying to find a free register to pop into, instead of a full-blown liveness check. If the adjustment immediately follows a call, then every register the call clobbers but doesn't define should be dead at that point, and can be used. Differential Revision: http://reviews.llvm.org/D11749 llvm-svn: 244578
2015-08-11 16:48:48 +08:00
; CHECK-NEXT: popl
[X86] Allow load folding into PUSH instructions Adds pushes to the folding tables. This also required a fix to the TD definition, since the memory forms of the push instructions did not have the right mayLoad/mayStore flags. Differential Revision: http://reviews.llvm.org/D11340 llvm-svn: 243010
2015-07-23 20:23:45 +08:00
; CHECK: nop
; CHECK: pushl (%esp)
; CHECK: calll
[X86] When optimizing for minsize, use POP for small post-call stack clean-up When optimizing for size, replace "addl $4, %esp" and "addl $8, %esp" following a call by one or two pops, respectively. We don't try to do it in general, but only when the stack adjustment immediately follows a call - which is the most common case. That allows taking a short-cut when trying to find a free register to pop into, instead of a full-blown liveness check. If the adjustment immediately follows a call, then every register the call clobbers but doesn't define should be dead at that point, and can be used. Differential Revision: http://reviews.llvm.org/D11749 llvm-svn: 244578
2015-08-11 16:48:48 +08:00
; CHECK-NEXT: popl
[X86] Allow load folding into PUSH instructions Adds pushes to the folding tables. This also required a fix to the TD definition, since the memory forms of the push instructions did not have the right mayLoad/mayStore flags. Differential Revision: http://reviews.llvm.org/D11340 llvm-svn: 243010
2015-07-23 20:23:45 +08:00
%c = add i32 %a, %b
call void @foo(i32 %c)
call void asm sideeffect "nop", "~{ax},~{bx},~{cx},~{dx},~{bp},~{si},~{di}"()
call void @foo(i32 %c)
ret void
}