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authorBrian Paul <[email protected]>2008-07-01 11:48:57 -0600
committerBrian Paul <[email protected]>2008-07-01 11:48:57 -0600
commit44c99ad23655204fd2e567fc38512f12e5f262af (patch)
tree954a996ef3c2dd659ba324efe4390529f6acc1db /src/glw
parent7d4f01413f16c15b55e99aba6da18b5c979c880c (diff)
mesa: better function inlining in the presence of 'return' statements
Before, the presence of a 'return' statement always prevented inlining a function. This was because we didn't want to accidentally return from the _calling_ function. We still need the semantic of 'return' when inlining but we can't always use unconditional branches/jumps (GPUs don't always support arbitrary branching). Now, we allow inlining functions w/ return if the return is the last statement in the function. This fixes the common case of a function that returns a value, such as: vec4 square(const in vec4 x) { return x * x; } which effectively compiles into: vec4 square(const in vec4 x) { __retVal = x * x; return; } The 'return' can be no-op'd now and we can inline the function. cherry-picked from master
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