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llvmpipe: Optimize away min/max with equal operands.

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This commit is contained in:
José Fonseca 2009-08-03 19:31:56 +01:00
parent 9e92244440
commit 02eaa32d83
1 changed files with 14 additions and 0 deletions
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14
src/gallium/drivers/llvmpipe/lp_bld_arit.c
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@ -288,6 +288,14 @@ lp_build_intrinsic_binary(LLVMBuilderRef builder,
}
assert(LLVMIsDeclaration(function));
#ifdef DEBUG
/* We shouldn't use only constants with intrinsics, as they won't be
* propagated by LLVM optimization passes.
*/
if(LLVMIsConstant(a) && LLVMIsConstant(b))
debug_printf("warning: invoking intrinsic \"%s\" with constants\n");
#endif
args[0] = a;
args[1] = b;
@ -678,6 +686,9 @@ lp_build_min(struct lp_build_context *bld,
if(a == bld->undef || b == bld->undef)
return bld->undef;
if(a == b)
return a;
if(bld->type.norm) {
if(a == bld->zero || b == bld->zero)
return bld->zero;
@ -699,6 +710,9 @@ lp_build_max(struct lp_build_context *bld,
if(a == bld->undef || b == bld->undef)
return bld->undef;
if(a == b)
return a;
if(bld->type.norm) {
if(a == bld->one || b == bld->one)
return bld->one;